文献类型：期刊文献

英文题名：Thermally stable SiO₂-doped mesoporous anatase TiO₂ with large surface area and excellent photocatalytic activity

作者：He, Chenxu[1,2];Tian, Baozhu[1,2];Zhang, Jinlong[1,2,3]

机构：[1]E China Univ Sci & Technol, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, Inst Fine Chem, Shanghai 200237, Peoples R China;[3]Guizhou Normal Univ, Sch Chem & Mat Sci, Guiyang 550001, Peoples R China

年份：2010

卷号：344

期号：2

起止页码：382

外文期刊名：JOURNAL OF COLLOID AND INTERFACE SCIENCE

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000275799100021)】；

基金：This work has been supported by National Nature Science Foundation of China (20773039, 20977030); National Basic Research Program of China (973 Program, 2007CB613301, 2010CB732306), and the Ministry of Science and Technology of China (2006AA06Z379, 2006DFA52710).

语种：英文

外文关键词：Mesoporous; TiO2; SiO2-doped; Thermally stable anatase; Photocatalyst

摘要：A thermally stable SiO2-doped mesoporous TiO2 with high crystallinity was prepared by a templating method. The content of SiO2 dopant was varied from 3% to 20%. The gels were characterized by TG-DTA analysis. And the resultant catalysts were investigated by various physicochemical techniques, such as WAXRD, Raman spectroscopy, N-2 adsorption-desorption, TEM, FT-IR, and XPS. The WAXRD, TEM, and Raman measurements suggest that the SiO2 dopant can enhance the thermal stability of the anatase phase remarkably. Rutile phase did not present at all even at 1000 C when the SiO2 content was up to 15%. N-2 adsorption-desorption results show that the SiO2-doped samples have uniform pore diameters and large specific surface area, which is beneficial for photocatalytic reaction. The photocatalytic activities of the samples were evaluated by degradation of Rhodamin-6G solution under UV irradiation. The results show that the SiO2-doped mesoporous TiO2 have better activity than commercial P25. Especially, the 15% SiO2-doped mesoporous TiO2 exhibited much higher photocatalytic activity than P25 in a large range of calcination temperatures, even at 900 degrees C. The excellent photocatalytic activity of the samples can be attributed to the high anatase crystallinity, large specific surface area, preserved surface hydroxyl groups and mesoporous channels. (C) 2010 Elsevier Inc. All rights reserved.